Electric hoist motor stator mount



IFeb. 19, 1957 E. E. RoBlNs Erm. 2,782,331

ELECTRIC HOIST MOTOR STATOR MOUNT Filed Dec. 13. 1955 ELECTRIC HOISTMOTR STATOR MOUNT Erford E. Robins, North Tonawanda, and Loren W. Lerehand Humphrey F. Parker, Buffalo, N. Y., assignors to Columbus McKinnonChain Corporation, Tonawanda,

Application December 13, 1955, Serial No. 552,939

4 Claims. (Cl. Sith-258) This invention relates to electric hoists, andmore particularly to improvements in electric hoist frame and motorassemblies.

It is an object of the present invention to provide in an electric hoistan improved motor mounting arrangement.

Another object of the invention is to provide an electric hoist ofimproved design, whereby to facilitate relative assembly of the motorand the ho-ist frame.

c Another object is to provide in an electric hoist constructionimproved means for anchoring the hoist motor stator in the hoist frameagainst motor torque reactions.

Other objects and advantages of the invention will appear in thespecification hereinafter.

In the drawing:

Fig. 1 is an end elevational View, with portions broken away to show theinterior construction, of a chain hoist embodying the invention; and

Fig. 2 is a fragmentary sectional View, taken along line II-lI of Fig.1.

As illustrated in the drawing, the invention may be embodied in anelectric hoist construction including a die cast or otherwise fabricatedhoist frame designated generally at 10, and arranged to be carried bymeans of a suspension hook 12, and having its load lift chain dependingtherefrom as indicated at 14. To drive the load lift wheel and the geartrain furnishing power thereto, the hoist includes an electric motorcomprising a stator subassembly and an armature 16; the motor torqueoutput shaft being indicated at 18. (Fig. 2.)

The present invention concerns the problem of mounting and anchoring themotor stator 15 in proper operative position within the hoist frame lil;and as illustrated herein, the purposes of the invention areaccomplished by forming the frame or housing of the hoist inmultisectioned form to include a main section as designated which isinternally bored to receive in slip-fitting relation therein (from theleft hand end thereof as viewed in Fig. 2) the stator 15 of the hoistmotor. The hoist frame portion 2i) is provided with an abutment shoulderas indicated at 22 (Fig. 2) against which one end of the stator 15lodges when it has been slip-tted into the frame piece 20 to its properdepth. Adjacent its opposite end, the peripheral side wall of the stator15 is provided with a radial bore or recess extending inwardly thereofto receive in rmly fitted relation therein an anchor pin 24. The recessand the pin are so relatively dimensioned that when the pin is tted intothe stator 15 it extends a substantial distance therefrom radiallybeyond the cylindrical wall of the stator as illustrated in the drawing.

The hoist frame section 20 is notched at its left hand peripheral edgeportion in registry with the position of the pin 24 when the stator 15is slip-fitted into the frame section 20 during the initial hoistassembly operation; the notched portion of the hoist frame beingdimensioned to closely complement and embrace the extending portion ofthe pin 24 when the left hand side portion of the pin means, areemployed to lock the hoist frame componentsv Ztl-26 together inassembled relation as shown in Fig. 2.

Thus, it will be appreciated that upon locking of the end cover piece 26against the frame section 2t), the cover piece 26 will bear against theextending end portion of the pin 24 so as to prevent Idisplacementthereof toward the left relative to the frame section 20, as shown inFig. 2. Thus, the protruding vend portion of the pin 24 is completelyencompassed at all sides by the final frame assembly whereby the stator15 is lirmly anchored in proper position within the frame component 20against movements relative thereto in any direction including rotationin response to torque reaction forces.

The frame section 25 is provided with a bearing device as indicated at30 to support the left hand end portion of the motor shaft 18, while theright hand end portion of the motor shaft 1S is similarly supported inAanother bearing (not shown) carried within the hoist frame section 2d,as is well understood in the art. Hence, by virtue of the frameconstruction of the present invention, the hoist components referred tohereinabove may be readily assembled by simply iirst slip-fitting thestator 1S in to the hoist section 2@ to its operative position as shownin Fig. 2; then sliding the motor armature into position so that theright hand end portion of the motor shaft engages its bearing; and thensliding the end cover frame section 26 into position so as tosimultaneously engage the bearing 30 upon the left hand end portion ofthe motor shaft 18 while bringing the right hand rim portion of thehousing 26 into abutting relation against the frame section 29; therebylocking the anchor pin 24 interiorly of the hoist' frame construction.As explained hereinabove, the machine screws 2S-28 are then employed tomaintain the frame parts in relative assembly. Thus, the cooperativeframe parts provide the motor bearing mountings and iirmly lock theanchor pin 24 in the hoist frame so as to thereby lock the motor inoperative position in the frame. It will be appreciated that theconstruction of the invention as explained hereinabove may be fabricatedby means of parts and shop methods of utmost simplicity, and that theconstruction facilitates initial assembly and subsequent disassembly andreassembly of the parts incidental to maintenance or repair operations.

Although only one form of the invention has been shown and described indetail, it will be apparent to those skilled in the art that theinvention is not so limited but that various changes may be made thereinwithout departing from the spirit of the invention or the scope of theappended claims.

We claim:

1. In an electric hoist, a frame including complementary shaped motormount and cover frame sections adapted to be assembled in abuttingaligned relation at opposed rim portions of the frame sections, a hoistmotor slip-tted into said motor mount frame section and having an anchorpin protruding radially therefrom, said motor mount frame section beingnotched to receive said protruding pin when the hoist motor isslip-fitted into said mount section while the protruding pin lies flushwith the rirn edge of said mount section, and means detachablyinterconnecting said mount section and said cover section whereby tolock them together in opposed Patented Feb. 19, 1957,

`rim abutting engagement whereby said cover section is held in abuttingengagement against on side of the protruding portion of said pin andwhereby the protruding portion of said pin is completely encircledbetween said frame sections, said cover section including a bearingmember engaging in slip-litting relation the shaft of said motor whensaid frame sections are brought together.

2. In an electric hoist, a two-piece frame including mating motor mountand cover frame sections assembled in abutting aligned relation atopposed rim portions of the yframe sections, a hoist motor statorslip-tted into said motor mount frame section and having an anchor pinprotruding radially therefrom, said lmotor mount frame section beingrecessed to receive said protruding pin in embedded relation thereinwhen the hoist motor is slip-fitted into said mount section while theprotruding pin lies ush with the rim edge of said mount section, andmeans locking said frame sections together in opposed rim abuttingengagement whereby said cover sec tion is held in abutting engagementagainst one side of the protruding portion of said pin and whereby theprotruding portion of said pin is completely encircled between saidframe sections, said cover section including a bearing member engagingin slip-tting relation the shaft of said motor when said frame sectionsare brought together.

3. In an electric hoist, a two-piece frame including mating motor mountand cover frame sections adapted to be assembled in abutting alignedrelation at opposed rim portions of the frame sections, a hoist motorslipfitted into said motor mount frame section and having an anchor pinprotruding radially therefrom, said motor mount frame section beingrecessed to receive said pro truding pin in embedded relation thereinwhen the hoist motor is slip-tted into said mount section while theprotruding pin lies flush with the rim edge of said mount section, andmeans detachably interconnecting said mount section and said coversection whereby to lock them together in opposed rim abutting engagementwhereby said cover section is held in abutting engagement against oneside of the protruding portion of said pin and whereby the protrudingportion of said pin is completely encircled between said trarnesections.

4. ln an electric hoist, a multi-part frame including mating motor mountand cover frame sections adapted to be assembled in abutting alignedrelation at opposed rim portions of the frame sections, a hoist motorslip-fitted into said motor mount frame section and having an anchor pinslip-tted into said motor and protruding radially therefrom, said motormount frame section being notched to receive the protruding portion ofsaid pin when the hoist motor is slip-fitted into said mount sectionWhile the protruding pin lies flush with the rim edge of said mountsection, and means detachably interconnecting said mount section andsaid cover section whereby to lock them together in opposed rim abuttingengagement whereby the protruding portion of said pin is completelyencircled between said frame sections to lock the motor positionallywithin said frame, said cover section including a bearing memberengaging in slip-fitting relation the shaft of said motor when saidframe sections are brought together.

No references cited.

